Optical Calcite Iceland Spar 21G Rectangular Display Specimen| 25x22x13mm|Clear|RARE!! ICELAND SPAR CALCITE 21g RECTANGULAR DISPLAY SPECIMEN!!! This stunning rectangular 21g Iceland Spar specimen is a beautiful example of optical calcite with brilliant clarity and natural geometric form. Measuring 25x22x13mm, this display crystal showcases the dazzling double refraction that Iceland Spar is known for an optical phenomenon that continues to amaze collectors, makers, and scientists alike. Revered for centuries, Iceland Spar has
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